Mostrando 601 - 620 Resultados de 2,457 Para Buscar '"Oar"', tiempo de consulta: 0.32s Limitar resultados
  1. 601
  2. 602
    “…BACKGROUND: The patient positioning in pelvic radiotherapy (RT) should be decided based on both reproducibility and on which position that yields the lowest radiation dose to the organs at risk (OAR), and thereby less side effects to patients. …”
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  3. 603
    “…CONCLUSIONS: The 4π technique provides significantly better OAR sparing than both cVMAT and nVMAT and enables more clinically relevant dose escalation for tumor local control. …”
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  4. 604
    “…CONCLUSIONS: The tumor tracking capability of the CK system can significantly decrease the volume of normal liver tissue receiving > 15 Gy, while maintaining high precision in target localization, conformity, tumor coverage, and dose sparing of the OAR. Therefore, it can be a valuable SBRT option, particularly for HCC patients with poor liver function.…”
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  5. 605
    “…Possible benefits include increased homogeneity, faster planning time, less inter‐planner variability and lower doses to organs at risk (OAR). We therefore conducted a pilot study of previously treated intact breast patients to compare the current forward‐planned ‘field‐in‐field’ technique (FP‐IMRT) with an IP‐IMRT alternative. …”
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  6. 606
    “…CONCLUSIONS: TDRs and RTs were not a limiting factor in this study. The suboptimal OAR poses significant quality and safety issues with this detection approach. …”
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  7. 607
    “…Maximum dose to organ at risk (OAR) (2 cc of OAR) ranged between 55-87% of prescribed dose, with a median dose being 80%. …”
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  8. 608
  9. 609
    “…FB plans were generated from the RayStation FB module by simulating the original plan target and organ at risk (OAR) dose distribution and delivered in various backup linear accelerators. …”
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  10. 610
  11. 611
  12. 612
    “…However, this increase did not typically result in appreciably improved OAR sparing. For Eclipse and Corvus, and to a much lesser extent BrainScan, increases in smoothing decreased DC but eventually caused unacceptable losses in plan conformality. …”
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  13. 613
    “…A doughnut‐shaped planning target volume (PTV, 6.1 cm(3)) and inner organ at risk (OAR, 0.3 cm(3)) were delineated for delicate intensity‐modulated radiosurgery test planning. …”
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  14. 614
    “…Percentage depth dose (PDD), off‐axis ratios (OAR), and ROF were measured using a stereotactic field diode (SFD). …”
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  15. 615
    “…Variations in mean and maximum target and organ at risk (OAR) doses as a function of positional shift were evaluated. …”
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  16. 616
    “…Target volume definition, total RT dose and fractionation schedule were reported adequately in 97% of included trials. OAR constraints, simulation procedures and presence or absence of deviations in RT treatment planning and delivery were reported adequately in 30% of included trials. …”
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  17. 617
    “…The 4π plans were created for each patient with 20 optimal beams selected using a greedy column generation method and subsequently recalculated in Eclipse for comparison. Organ-at-risk (OAR) doses, homogeneity index, conformity, and tumor control probability (TCP) were compared. …”
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  18. 618
  19. 619
    “…Clinical and treatment-related characteristics were obtained, including target volume and organ at risk (OAR) dosimetric characteristics. Patients were followed clinically and with at least yearly mammograms for up to 36 months (range 5–36 months). …”
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  20. 620
    “…However, for some sites, this may not be strictly necessary and removing this constraint could theoretically improve organ‐at‐risk (OAR) sparing and tumor control probability (TCP). …”
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